Ds is one and bites me regularly. He comes in for a cuddle and then takes a good old bite of neck/arm/cheek/any body part nearby. I know his teeth are really sore but he hardly ever bites anyone else. I say no loudly and firmly and put him down and walk off, he then cries but it doesn't stop him doing it minutes later.
Any ideas? MIL and Mum and Grandma "helpfully" suggested biting him back